Add the sifted cocoa powder, organic cane sugar, milk, and a pinch of salt to a pan over medium heat.
Whisk continuously for about 3-4 minutes or until the sugar is melted. This syrup will continue to thicken as it cools. If you want a thinner consistency, add 1-2 more tablespoons of milk or water.
Add 1-2 tablespoons of chocolate syrup to the bottom of a tall glass.
Fill with ice and pour in the oat milk.
Brew a double shot of espresso and pour over the oat milk. Stir and taste to adjust chocolate flavor and sweetness.
If making a hot mocha latte, froth and steam the milk and omit the ice.